From: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
Date: Sun, 4 Oct 2015 15:59:54 +0000 (+0530)
Subject: WIP: UDP tracker: send/receive request/response
X-Git-Url: https://git.rkrishnan.org/pf/content/%22news.html/%22file:/frontends/CLI.txt?a=commitdiff_plain;h=3dd1ec8312982d53dfc8e5e80f94d7a98f8a9e4e;p=functorrent.git

WIP: UDP tracker: send/receive request/response
---

diff --git a/src/FuncTorrent/Tracker.hs b/src/FuncTorrent/Tracker.hs
index f995f1b..6ae0281 100644
--- a/src/FuncTorrent/Tracker.hs
+++ b/src/FuncTorrent/Tracker.hs
@@ -7,14 +7,16 @@ module FuncTorrent.Tracker
 
 import Prelude hiding (lookup, splitAt)
 
+import System.IO (Handle)
 import Control.Applicative (liftA2)
 import Control.Concurrent (threadDelay)
 import Control.Concurrent.MVar (MVar, newEmptyMVar, newMVar, readMVar, putMVar)
-import Data.Binary (Binary(..))
+import Data.Binary (Binary(..), encode, decode)
 import Data.Binary.Put (putWord16be, putWord32be, putWord64be, putByteString)
 import Data.Binary.Get (Get, isEmpty, getByteString, getWord16be, getWord32be)
-import Data.ByteString (ByteString)
+import Data.ByteString (ByteString, hGet, hPut)
 import Data.ByteString.Char8 as BC (pack, unpack, splitAt)
+import Data.ByteString.Lazy (fromStrict, toStrict)
 import Data.Char (chr)
 import Data.List (intercalate)
 import Data.Map as M (lookup)
@@ -22,7 +24,8 @@ import Network (PortNumber)
 import Network.HTTP.Base (urlEncode)
 import qualified Data.ByteString.Base16 as B16 (encode)
 
-import FuncTorrent.Bencode (BVal(..), decode)
+import FuncTorrent.Bencode (BVal(..))
+import qualified FuncTorrent.Bencode as Benc
 import FuncTorrent.Metainfo (Info(..), Metainfo(..))
 import FuncTorrent.Network (sendGetRequest)
 import FuncTorrent.Peer (Peer(..))
@@ -219,7 +222,7 @@ trackerLoop port peerId m st = do
   up <- readMVar $ uploaded st
   down <- readMVar $ downloaded st
   resp <- sendGetRequest (head . announceList $ m) $ mkArgs port peerId up down m
-  case decode resp of
+  case Benc.decode resp of
     Left e -> return $ pack (show e)
     Right trackerInfo ->
       case mkTrackerResponse trackerInfo of
@@ -229,3 +232,14 @@ trackerLoop port peerId m st = do
           _ <- putMVar (connectedPeers st) (peers tresp)
           trackerLoop port peerId m st
 
+-- udp tracker
+getResponse :: Handle -> IO UDPResponse
+getResponse h = do
+  -- connect packet is 16 bytes long
+  -- announce packet is atleast 20 bytes long
+  bs <- hGet h (16*1024)
+  return $ decode $ fromStrict bs
+
+sendRequest :: Handle -> UDPRequest -> IO ()
+sendRequest h req = hPut h bsReq
+  where bsReq = toStrict $ encode req